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1. The banker's discount of a certain sum of money is Rs. 72 and the true discount on the same sum for the same time is Rs. 60. The sum due is:

A. Rs. 360

B. Rs. 432

C. Rs. 540

D. Rs. 1080

Solution:

\begin{aligned} \frac{B . D . \times T . D .}{B . D . - T . D .} \\ = R s . (\frac{72 \times 60}{72 - 60}) \\ = R s . (\frac{72 \times 60}{12}) \\ = R s . 360 \end{aligned}

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